Question

a) write electronic configurations given orbital s=7 electrons, orbital p= 12 electrons & d=5 electrons
answer: 1s^1 2s^2 2p^6 3s^2 3p^6 4s^1 3d^5
b) compare electrical conductivity of L with that of silicon?
@Abhisar

Answer 1

the electronic configuration is for atom L

Answer 2

1s^1 2s^2 2p^6 3s^2 3p^6 4s^1 3d^5
u did it wrong tho

Answer 3

1s^2 2s^2 2p^6 3s^2 3p^6 4s^1 3d^5

Answer 4

like this

Answer 5

yeah now its good

Answer 6

what is the element L? what do u think>?

Answer 7

It's a transition element

Answer 8

yeah but which exactly?

Answer 9

Do I need to find out the electronic confi.. of each transition elements first

Answer 10

that configuration given is for L right?

Answer 11

ys

Answer 12

okay cool
its Cr

Answer 13

Okay coz

Answer 14

do u get how i found out?

Answer 15

the valence electron=6

Answer 16

no

Answer 17

when u r given electronic configuration, total number of electrons= protons= thus you can find out which element it is by its atomic number

Answer 18

for Cr its 24 as given
for Si its 14

Answer 19

Okay

Answer 20

now the question is what is conductivity?

Answer 21

yes..

Answer 22

Cr has high electrical conductivity

Answer 23

yes

Answer 24

the reason is because it has more of delocalized electrons

Answer 25

Thanks..!

Answer 26

no problem :)

Answer 27

u've gotta know that for 'electrical' or 'thermal' or conductivity in general there has to be free/mobile/delocalized electrons

Answer 28

so if u r given 2 elements which you r sure that both conduct, all u need to look at is how many electrons does each have

Answer 29

In this case, the d electrons are loosely bound

Answer 30

rite

Answer 31

you can't really say that i guess
do u know how these orbitals look like and how electrons are arranged?

Answer 32

I don't know how d orbital looks like

Answer 33

p-orbital looks like dumbbell shape

Answer 34

https://www.google.ae/search?q=d+orbital+shape&hl=en&source=lnms&tbm=isch&sa=X&ei=3JelU5_cIojV0QWk4oHgDw&ved=0CAYQ_AUoAQ&biw=962&bih=683#facrc=_&imgdii=H-r--EjRfEnUiM%3A%3BmiMc1BBgHOaLcM%3BH-r--EjRfEnUiM%3A&imgrc=H-r--EjRfEnUiM%253A%3Bw6pxxZ5eRoNrsM%3Bhttp%253A%252F%252Fwww.geo.arizona.edu%252Fxtal%252Fgeos306%252Fd-orbitals.gif%3Bhttps%253A%252F%252Fsites.google.com%252Fa%252Fggwo.org%252Fggca_science_lab%252FHome%252Fchemistry%252Fchemistry-atomic-structure%252Fchemistry-atomic-orbital-shapes%3B461%3B602

Answer 35

i won't go into orbital shape
but mobile/delocalized electrons means electrons can move about
they are not fixed in one position

Answer 36

Understood

Answer 37

http://www.rsc.org/chemsoc/visualelements/orbital/orbital_d.html

Answer 38

yeah :)